Methods and apparatuses for configuration of sounding reference signal for serving and neighboring cell measurements

ABSTRACT

Methods and apparatuses are described for configuring a downlink (DL) reference signal (RS) for an electronic device (ED). Configuration information associated with the DL RS is received in a first communication from a location management function (LMF) via LTE positioning protocol (LPP). In a communication from a serving cell via radio resource control (RRC), an identifier (ID) of the DL RS and a cell ID of a cell that originates the DL RS are received. The configuration information received in the first communication also includes the ID of the DL RS and the cell ID. A sounding reference signal (SRS) is transmitted to the cell identified by the cell ID, according to path loss (PL) information or spatial domain transmission filter (TF) information associated with the DL RS.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims priority from U.S. provisional patentapplication No. 62/886,145, entitled “METHODS AND APPARATUSES FORCONFIGURATION OF SOUNDING REFERENCE SIGNAL FOR SERVING AND NEIGHBORINGCELL MEASUREMENTS”, filed Aug. 13, 2019, the entirety of which is herebyincorporated by reference.

FIELD

The present disclosure relates generally to wireless communications. Invarious examples, the present disclosure is related to methods andapparatuses for configuration of sounding reference signal power.

BACKGROUND

In conventional cellular networks, each cell is associated with acoverage area and includes one or more base stations (BSs) (alsoreferred to as transmit-receive points (TRPs)), each having a radiofrequency (RF) transceiver for transmitting and receiving wirelesssignals. Each cell is assigned a physical cell identifier (PCID) thatmay be common among all BSs within the cell. The PCID in partfacilitates control channel and data channel communications from thecell to an electronic device (ED) (e.g., a user equipment (UE)) and fromthe ED to the cell. The cell that is presently serving an ED is referredto as the serving cell for that ED. The network may maintain theassociation between the serving cell and the ED, through an assignedPCID, until a handover is triggered.

The network may implement a location management function (LMF), whichprovides location services such as determining the location of an ED(also referred to as “positioning” of the ED) based on the receivedmeasurements from other entities in the network such as cells (includingserving and non-serving cells) and/or the ED. The LMF may be implementedin a cell (e.g., LMF services may be provided by a BS of the cell), ormay be implemented in the core network, for example.

An ED transmits a sounding reference signal (SRS) that can be used by anetwork side device to determine channel characteristics about thechannel between the ED and the network device. In Release 15 (Rel. 15)New Radio (NR), the use of SRS is performed with regard to a networkside device that is presently serving the ED. That is, the SRS iscurrently intended to be received and measured only by the serving cell.

It would be desirable to provide solutions that enable the ED totransmit a SRS that is intended to be received by other than the servingcell. Such solutions may enable the SRS to be used for positioningpurposes, for example at the LMF, or for inter-cell or intra-cellmobility purposes.

SUMMARY

In various examples disclosed herein, solutions are provided forconfiguration of SRS power, to enable transmission of a SRS from the EDto a non-serving cell (e.g., a neighboring cell).

The present disclosure describes examples for configuration of a pathloss (PL) reference signal (RS), which may be sent to the ED by aserving cell or by the LMF. The PL RS may be in the form of a PLpositioning reference signal (PRS), a PL synchronization signal/physicalbroadcast channel block (SSB) or a PL channel stateinformation-reference signal (CSI-RS), for example.

The present disclosure also describes examples for configuration of atransmission filter (TF) RS, which may be sent to the ED by a servingcell or by the LMF. The TF RS may be in the form of a TF PRS, a TF SSBor a TF CSI-RS, for example.

In various examples, the present disclosure describes possible fallbackprocedures that may be used if the ED does not receive or detect anexpected PL CSI-RS, TF CSI-RS, PL PRS, or TF PRS.

In various examples, the present disclosure describes possibleprocedures that enable the ED to receive the configuration of PL RS orTF RS from the LMF, and that enable the LMF to acquire PL RS or TF RSconfiguration details.

The present disclosure also describes examples that enable a servingcell to acquire PL RS or TF RS configuration details from a non-servingcell, from the LMF, or from a non-serving cell, via, for example, theLMF.

The various examples described herein may help to enable the ED toproperly receive DL RS from a cell (including a serving cell or anon-serving cell), and to determine PL and/or TF for transmission of aSRS to a cell (including a serving cell or a non-serving cell). Theseexamples may enable the SRS to be used for mobility purposes,positioning purposes, or any other application that may require the EDto transmit SRS to a cell (including a serving cell or a non-servingcell).

In some example aspects, the present disclosure describes a method at anetwork entity implementing a location management function (LMF). Themethod includes: receiving, from a radio access network (RAN) node, aconfiguration message containing configuration information associatedwith a downlink (DL) reference signal (RS); and transmitting theconfiguration information to at least one of: an electronic device (ED),the configuration information enabling the ED to use the DL RS to obtainpath loss (PL) information or spatial domain transmission filter (TF)information for the purpose of transmitting a sounding reference signal(SRS); or a serving RAN node serving the ED.

In any of the examples, the method may include: transmitting to the RANnode a request for the configuration information.

In any of the examples, the request may be transmitted to the RAN nodevia New Radio Positioning Protocol A (NRPPa).

In any of the examples, the DL RS may be a DL synchronizationsignal/physical broadcast channel block (SSB) or a DL positioningreference signal (PRS).

In any of the examples, the configuration message may be received from anon-serving RAN node via New Radio Positioning Protocol A (NRPPa), andthe configuration information is transmitted to the serving RAN node viaNRPPa.

In any of the examples, the configuration information may be transmittedto the ED via LTE positioning protocol (LPP).

In any of the examples, the configuration information may include aquasi colocation-Type D (QCL-D) field providing information aboutanother configured reference signal that is QCL-D with the DL RS. The EDmay be enabled to detect the DL RS based on a configuration for theother configured reference signal.

In some example aspects, the present disclosure describes a method at anelectronic device (ED). The method includes: receiving configurationinformation associated with a downlink (DL) reference signal (RS) in afirst communication from a location management function (LMF) via LTEpositioning protocol (LPP); receiving, in a second communication from aserving cell for the ED via radio resource control (RRC), an identifier(ID) of the DL RS and a cell ID of a cell that originates the DL RS,wherein the configuration information received in the firstcommunication also includes the ID of the DL RS and the cell ID; andtransmitting a sounding reference signal (SRS) to the cell identified bythe cell ID, according to path loss (PL) information or spatial domaintransmission filter (TF) information associated with the DL RS.

In any of the examples, the DL RS may be a DL positioning referencesignal (PRS), and the configuration information associated with the DLRS may include one or more of: a resource ID of the DL PRS; the cell IDof the cell that originates the DL PRS; a quasi colocation-Type-D(QCL-D) field providing information about another configured referencesignal that is QCL-D with the DL PRS; a New Radio AbsoluteRadio-Frequency Channel Number (NR ARFCN) for determining a frequencydomain location of the DL PRS; a bandwidth of the DL PRS; a slot offsetof the DL PRS; a frame offset of the DL PRS; a symbol offset of the DLPRS; a muting configuration of the DL PRS; a periodicity and offset ofthe DL PRS; and a scrambling ID of the DL PRS.

In any of the examples, the DL RS may be a DL synchronizationsignal/physical broadcast channel block (SSB), and the configurationinformation associated with the DL RS may include one or more of: a SSBindex of the DL SSB; the cell ID of the cell that originates the DL SSB;and one or more parameters locating the DL SSB in time-frequency domain.

In any of the examples, the configuration information associated withthe DL RS may enable the ED to use the DL RS for information other thanPL and spatial domain TF, and the later second communication may enablethe ED to use the DL RS for PL information or spatial domain TFinformation.

In any of the examples, the configuration information associated withthe DL RS may enable the ED to use the DL RS for PL information orspatial domain TF information.

In any of the examples, the DL RS may be a DL positioning referencesignal (PRS), and the configuration information associated with the DLRS may include one or more of: a resource ID of the DL PRS; the cell IDof the cell that originates the DL PRS; a quasi colocation-Type-D(QCL-D) field providing information about another configured referencesignal that is QCL-D with the DL PRS; a New Radio AbsoluteRadio-Frequency Channel Number (NR ARFCN) for determining a frequencydomain location of the DL PRS; a bandwidth of the DL PRS; a slot offsetof the DL PRS; a frame offset of the DL PRS; a symbol offset of the DLPRS; a muting configuration of the DL PRS; a periodicity and offset ofthe DL PRS; and a scrambling ID of the DL PRS.

In any of the examples, the DL RS may be a DL synchronizationsignal/physical broadcast channel block (SSB), and the configurationinformation may include one or more of: a SSB index of the DL SSB; thecell ID of the cell that originates the DL SSB; and one or moreparameters locating the DL SSB in time-frequency domain

In some example aspects, the present disclosure describes a method at anelectronic device (ED). The method includes: obtaining, by the ED, pathloss (PL) information based on a second downlink (DL) reference signal(RS) after a first DL RS has not been received during an expected timeor timeframe, or in absence of configuration information for receivingthe first DL RS; and transmitting a sounding reference signal (SRS), theSRS being transmitted according to the PL information.

In any of the examples, the second DL RS may be a synchronizationsignal/physical broadcast channel block (SSB) used by the ED to obtain aMasterInformationBlock (MIB) parameter, and may be later used by the EDto obtain the PL information.

In some example aspects, the present disclosure describes an apparatusincluding a processing unit. The processing unit is configured toexecute instructions to cause the apparatus to perform any of themethods described above.

In some example aspects, the present disclosure describes acomputer-readable medium storing instructions which, when executed by aprocessing unit of an apparatus, cause the apparatus to perform any ofthe methods described above.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will now be made, by way of example, to the accompanyingdrawings which show example embodiments of the present application, andin which:

FIG. 1 is a schematic diagram of an example communication systemsuitable for implementing examples described herein;

FIGS. 2A and 2B are block diagrams showing an example base station (BS)and an example electronic device (ED), respectively, suitable forimplementing examples described herein;

FIG. 3 is a schematic diagram illustrating two neighboring cells of anexample communication system, suitable for implementing examplesdescribed herein;

FIG. 4 is an example dataflow illustrating an example of soundingreference signal (SRS) measurement, in accordance with examplesdescribed herein;

FIG. 5 is a flowchart illustrating an example method for configurationof a downlink (DL) reference signal (RS) and transmission of a SRS to anon-serving cell;

FIG. 6 is a flowchart illustrating another example method forconfiguration of a DL RS and transmission of a SRS to a non-servingcell;

FIG. 7 is a flowchart illustrating an example method for a fallbackprocedure when an expected DL RS is not received;

FIG. 8A is a flowchart illustrating an example method for a locationmanagement function (LMF) to provide configuration information to an ED;

FIG. 8B is a signaling diagram illustrating example signaling for a LMFto provide configuration information to an ED;

FIG. 9 is a flowchart illustrating an example method for a base station(BS) of a serving cell to provide configuration information to an ED;and

FIGS. 10A-10E are signaling diagrams illustrating example signaling fora serving cell to provide configuration information to an ED.

Similar reference numerals may have been used in different figures todenote similar components.

DESCRIPTION OF EXAMPLE EMBODIMENTS

In Release 15 (Rel. 15) New Radio (NR), procedures that have beenaccepted into the NR standard do not provide for measurement of asounding reference signal (SRS) by a non-serving cell. Examplesdescribed herein may aid in implementing SRS measurement by non-servingcells (e.g., neighboring cells) as well as serving cells. The solutionsdescribed herein may facilitate usage of SRS for, for example,positioning of an electronic device (ED) (e.g., a user equipment (UE))or uplink (UL)-based inter-cell or intra-cell mobility among otherpossible applications.

In various examples, the present disclosure describes methods andmechanisms that may be based on modification of some knownmethodologies. Modifying existing methods may allow for easierimplementation with existing methods and/or easier adoption across theindustry.

In order to enable SRS measurement by a non-serving cell, there areseveral issues that may need to be addressed with respect to theconventional SRS measurement, which only relies on the serving cell.

One issue relates to enabling the ED to transmit an SRS to a transceiverthat is not associated with the serving cell. In other words, the EDshould be able to transmit an SRS to a non-serving cell. In order to beable to use beamforming to transmit an SRS to a non-serving cell, the EDshould be provided with SRS configuration parameters that include acollection of transmission variables that define or control thetransmitted SRS signal. These transmission variables include, forinstance, variables pertaining to spatial domain transmission filter,path loss, transmission power, SRS periodicity and resource mapping. Inparticular, the SRS spatial domain transmission filter (TF) defines thedirectionality of the signal (e.g., beamforming parameters) and enablesthe ED to send the SRS in a direction that can be received by thenon-serving cell.

Conventionally, the ED is able to determine the SRS spatial domain TFfor a BS of a serving cell based on a first reference signal (RS) thatis transmitted by the serving cell. This first RS may inform the EDabout transmission variables pertaining to spatial domain TF and/or pathloss (PL).

Conventionally, the ED can listen for the first RS from the BS of theserving cell using receive beams. Based on configuration informationprovided to the ED regarding where in the time-frequency resource theserving cell is sending the first RS, the ED can determine where thesignal is strongest and associate that direction with the BS of theserving cell. For example, this configuration may involve using a“SRS-SpatialRelationInfo” field in the “SRS-Resource” field of a“SRS-Config” message. The RS can be one of: 1) SS/PBCH block(synchronization signal/physical broadcast channel block) (SSB)resource; 2) channel state information reference signal (CSI-RS)resource; 3) sounding reference signal (SRS) resource.

In the case of “SRS-spatialRelationInfo” is used as in the current 3GPPstandard, the content of the field is SRS resource specific and includesa servingCellId, and one of the following three reference signalindicators: 1) SSB index; or 2) CSI-RS resource index; or 3) SRSResource index, and a corresponding uplink bandwidth part (UL BWP).

According to the current standard, if the configured RS transmitted bythe serving cell is a SSB or CSI-RS resource, then the ED shall transmitthe target SRS resource with a same spatial domain transmission filterthat was used for the reception of the SSB or CSI-RS. If the RS isanother SRS resource, then the ED may transmit the target SRS resourcewith a same spatial domain transmission filter used for the transmissionof the indicated SRS.

RSs for determining the spatial transmission filter of SRS according tothe Rel. 15 NR 3GPP standard are configured by a serving cell, and aretransmitted from the BS(s) of a serving cell. A problem with this withregard to SRS measurement by a non-serving cell is that when the SRSneeds to be received by a BS in a non-serving cells, configuring the SRStransmission based on a RS from the serving cell may not be adequate.

In examples described herein, a transmission filter RS (TF RS) is usedfor determining the spatial domain transmission filter. A TF RS resourceis used for determining the spatial domain transmission filter of thetarget SRS resource. Four TF RS resources are applicable: SSB resourceused as a TF RS (called, for the sake of brevity, here as TF SSB),CSI-RS resource used as a TF RS (called, for the sake of brevity, hereas TF CSI-RS), downlink (DL) positioning reference signal (PRS) (called,for the sake of brevity, here as TF PRS) and SRS resource (called, forthe sake of brevity, here as TF SRS). In this disclosure, theconfiguration of some DL TF RSs are described, namely, TF SSB, TFCSI-RS, and TF PRS.

An issue of the conventional method of SRS configuration relates todetermining the transmission power that the ED should use to send theSRS signal. In Rel 15 of the 3GPP standard, the SRS transmission poweris determined using the following formula:

${P_{{SRS},b,f,c}\left( {i,q_{s},l} \right)} = {A_{1} = {\min \left\{ {\begin{matrix}{P_{{CMAX},f,c}(i)} \\\underset{\underset{{Open}\mspace{14mu} {loop}\mspace{14mu} {component}}{}}{{P_{{O\; \_ \; {SRS}},b,f,c}\left( q_{s} \right)} + {10\; {\log_{10}\left( {2^{\mu} \cdot {M_{{SRS},b,f,c}(i)}} \right)}} + {{\alpha_{{SRS},b,f,c}\left( q_{s} \right)} \cdot {{PL}_{b,f,c}\left( q_{d} \right)}}}\end{matrix} + \underset{\underset{{closed}\mspace{14mu} {loop}\mspace{14mu} {component}}{}}{h_{b,f,c}\left( {i,l} \right)}} \right.}}$

Where:

P_(SRS,b,f,c)(i,q_(s),l) is the total transmit power of a SRS in dBmover one SRS symbol in SRS resource set q_(s) across all ports for ULbandwidth part (BWP) b of carrier f of serving cell c, in power control(PC) adjustment state with index l, and in SRS transmission occasion i.The transmit power in this representation is split equally across allconfigured ports.

P_(CMAX,f,c)(i) is the maximum output power of the ED, that is definedin specifications (RAN4 (TS 38.101-1/38.101-2)).

P_(o_SRS,b,f,c)(q_(s)) is a higher layer configured baseline power valueper SRS resource set q_(s).

M_(SRS,b,f,c)(i) is the SRS bandwidth (BW) in resource blocks (RBs) perSRS resource.

α_(SRS,b,f,c)(q_(s)) is a higher layer configured scaling factor per SRSresource set q_(s), and having the default value of 1.

PL_(b,f,c)(q_(d)) is a DL PL estimate in dB, and is calculated by the EDbased on the RS resource index q_(d). In Rel 15, the RS resource indexq_(d) is provided by the higher layer parameter pathloss reference RS(pathlossReferenceRS) associated with the SRS resource set q_(s). ThisRS that is used for this determination of the DL PL may be referred toas a PL RS. In Rel. 15, two PL RS resources are applicable: PL SSB andPL CSI-RS resource. In the current 3GPP standard, if the ED is notprovided a PL RS resource (e.g., higher layer parameterpathlossReferenceRS in 3GPP TS38.331) or the ED has not yet beenprovided dedicated higher layer parameters, the ED calculatesPL_(b,f,c)(q_(d)) using a RS resource obtained from the SS/PBCH blockthat the ED uses to obtain higher layer parameter MasterInformationBlock(MIB). As can be observed, the conventional PL RS is used to calculatePL to the serving cell which, itself, is used to determine the SRStransmission power that is required for SRS signal be received at theserving cell with enough power so the SRS can be measured properly.

h_(b,f,c)(i,l) is a PC adjustment state with index l in SRS transmissionoccasion i.

According to the conventional power control mechanism, the SRS powercontrol is per SRS resource set and all SRS resource sets are configuredfor (meant to be measured at) the serving cell. In order to enable SRSmeasurement by a non-serving cell, there is a need for a solution thatenables configuration of different SRS resource sets, each of which ismeant to be measured by a serving cell, non-serving cell.

According to the Rel. 15 3GPP standard, a PL RS resource is configuredand transmitted from the serving cell. Transmitting the PL RS from onlythe serving cell results in a problem for SRS measurement by anon-serving cell, because the PL RS cannot be used to calculate the PLof a SRS resource for a non-serving cell. In particular, a non-servingcell is typically located farther than the serving cell with respect tothe ED and, as a result, experience a larger PL. If the UE uses the PLRS that is configured and transmitted from the serving cell to calculatethe transmit power for a SRS that is intended for the non-serving cell,the SRS may not be transmitted with enough power for the non-servingcell to accurately detect and measure the SRS.

In order to enable the SRS to be received by a non-serving cell (e.g.,for positioning or mobility purposes) a DL RS from a non-serving cellshould be configured to be used as a DL PL RS, for the purpose of SRSpower control. As mentioned above, the DL PL RS may be in the form of aCSI-RS, a SSB, or DL positioning reference signal (PRS), for example. Itwould also be desirable for there to be a fallback procedure in theevent the ED is not able to obtain the PL RS.

For enabling UL beam management/alignment towards a non-serving cell,there should be configuration of a spatial relation between a referenceDL RS from a non-serving cell and the target SRS. The reference DL RScan be in the form of a SSB, a CSI-RS, or DL-PRS, for example.

It should be noted that these configurations, which enable transmissionof the SRS to a non-serving cell may be in addition to existing Rel 15specifications. That is, these configurations do not necessarily excludethe possibility of the ED transmitting the SRS to be received by theserving cell.

In the present disclosure, the reference DL RS used for spatial relationbetween a non-serving cell (or serving cell) and SRS may be referred toas a TF RS for the sake of brevity. Moreover, TF SSB is used to refer toa SSB that is used as TF RS; TF CSI-RS is used to refer to a CSI-RS thatis used as TF RS; and TF PRS is used to refer to a PRS that is used asTF RS.

In the present disclosure, the PL reference RS pathlossReferenceRS maybe referred to as a PL RS for the sake of brevity. Moreover, PL SSB isused to refer to a SSB that is used as PL RS; PL CSI-RS is used to referto a CSI-RS that is used as PL RS; and PL PRS is used to refer to a PRSthat is used as PL RS.

The present disclosure provides examples that address one or more of thechallenges described above. It should be understood that examples thatare described with reference to the configuration of PL RS may also beadapted for configuration of the TF RS (and vice versa).

In embodiments of the present disclosure, CSI-RS resources from theserving and/or the neighboring cells may be supported to be used as thespatialRelationInfo RS for the positioning SRS. CSI-RS transmit beamsare UE-specific and typically narrower than the SSB transmit beams and,as such, are better candidates for the spatialRelationInfo RS ingeneral. For mobility purposes, A UE can be configured in MeasObjectNRto measure multiple groups of CSI-RS resources where each group istransmitted from a serving or a neighbouring cell. If some of theseneighbouring cells are also the target cells in the UL-basedpositioning, their configured CSI-RS resources in MeasObjectNR are knownat the UE and can be directly indicated to the UE as thespatialRelationInfo RS for the positioning SRS.

The embodiments of the present disclosure, the DL PRS from the servingand/or the neighbouring cells may be indicated as a spatialRelationInfoRS for the positioning SRS. If UE is configured to measure DL PRS fromthe serving and/or the neighbouring cells for, e.g., the DL-based ormulti-RTT positioning, as long as the configuration is valid, theconfigured DL PRS can also be indicated to the UE to be used for anyother purposes. This includes the use of the configured DL PRS as aspatialRelationInfo RS for the positioning SRS. In the multi-RTTpositioning solution, the RTT is measured between a UE-gNB pair: the gNBthat transmits DL PRS for the “UE Rx−Tx time difference measurement” isthe recipient of the SRS for the “gNB Rx−Tx time difference measurement”from the same UE. As such, it is logical to have a spatial relationbetween the DL PRS for the “UE Rx−Tx time difference measurement” andthe corresponding SRS for the “gNB Rx−Tx time difference measurement”.This can be realized by indicating the DL PRS as a spatialRelationInfoRS for the corresponding SRS.

It is supported that in the embodiments of the present disclosure theconfiguration of CSI-RS and/or DL-PRS from the serving and/or theneighboring cells as a spatialRelationInfo RS for the positioning SRS.For positioning purposes, in addition to SSB, support configuring CSI-RSand DL-PRS from the serving and the neighboring cells as aspatialRelationInfo RS.

In the embodiment of the present disclosure, some parameters arerequired to uniquely identify the spatialRelationInfo RS. In general,and considering the fact that the spatialRelationInfo RS can be from theneighboring cells, spatialRelationInfo RS configuration may indicate allparameters that are required to detect a DL RS. This, depending on theDL RS type (SSB, CSI-RS, or DL PRS), includes reference time andfrequency points, time and frequency domain resource mapping parameters,periodicity and offset, PCID, resource ID, scrambling ID, and possiblyQCL-D properties. It may be possible to configure thespatialRelationInfo RS from the set of DL RSs that are already detectedby the UE and/or configured to the UE for potentially other purposes.This includes the detected SSBs from the serving or neighboring cellsduring, for instance, the initial access, configured CSI-RS resourcefrom the serving cell, configured SSBs or CSI-RS resources inMeasObjectNR from the serving or neighboring cells, or configured DL PRSresources for the RSTD or the UE Rx−Tx time difference measurements. Insuch a case, to uniquely identify the spatia/RelationInfo RS, it isrequired to indicate to the UE the DL RS resource ID and the PCID of thecorresponding serving or neighboring cell. Note that, for instance inthe case of CSI-RS, (non-zero power) CSI-RS resources are configured intwo different locations in Rel. 15: CSI-RS resources from the servingand neighboring cells for the purpose of mobility are configured inCSI-RS-ResourceConfigMobility and indexed by CSI-RS-Index and CSI-RSresources from only the serving cell for various in-cell measurementpurposes are configured in NZP-CSI-RS-Resource and indexed byNZP-CSI-RS-ResourceId. If the spatia/RelationInfo CSI-RS is indicatedfrom the set of DL RSs that are already known (configured) to the UE,the CSI-RS resource ID should refer to the CSI-RS-Index used inCSI-RS-ResourceConfigMobility at least in the case that the target cellis a neighboring cell.

In one embodiment, parameters maybe added in the spatia/RelationInfofield to be able to additionally indicate a SSB or CSI-RS from aneighboring cell, or a DL PRS from a serving or a neighboring cell. ALMF may send the configurations of the serving and neighboring cells' DLPRS resources to the UE using LPP and the serving cell is transparent tothe DL PRS configurations of the neighboring cells. If the DL PRS thatis used as a spatia/RelationInfo RS is already configured to the UE bythe LMF for, e.g., the RSTD or the UE Rx−Tx time differencemeasurements, the serving cell only needs to indicate the DL PRSresource ID and the PCID of the corresponding cell to configure the DLPRS as the spatialRelationInfo RS in SRS-Con fig IE in RRC. The DL PRSresource ID and the PCID of the neighboring cell can be provided by theLMF to the serving cell using NRPPa. The spatialRelationInfo RS isconfigured in RRC and the spatialRelationInfo RS configuration at leastincludes the DL reference signal (SSB, CSI-RS, or DL-PRS) resource IDand the Cell ID of the transmitting serving/neighboring cell.

In some embodiments of the present disclosure, considering the fact thatthe spatialRelationInfo RS may be transmitted from the neighboringcells, it is supported that some UE fallback behavior in the case that aspatialRelationInfo RS is configured but is not detected. If a celltransmits a spatialRelationInfo RS but this spatialRelationInfo RS isnot detected by the UE, a reasonable approach would be using a detectedDL RS from the same cell as the fallback spatialRelationInfo RS. If thecell is a serving cell, the fallback spatialRelationInfo RS can be theSSB used to obtain MIB and if the cell is a neighboring cell, thefallback spatialRelationInfo RS can be the detected SSB from that cellwith the highest RSRP. Thus, if a spatialRelationInfo RS is configuredbut not detected, UE uses the following as a substitutespatialRelationInfo RS: if the cell that transmits thespatialRelationInfo RS is a serving cell, the substitutespatialRelationInfo RS is the SSB used to obtain MIB, or if the cellthat transmits the spatialRelationInfo RS is a neighboring cell, thesubstitute spatialRelationInfo RS is the detected SSB from that cellwith the highest RSRP.

If a spatialRelationInfo RS is not configured, it is up to the UE how toform the SRS transmit beam. For instance, if none of the SRS resourcesin a SRS resource set is configured with a spatialRelationInfo RS, UEmay transmit the SRS resources using transmit beam sweeping.

In embodiments of the present disclosure, the SSB and/or CSI-RS from theserving and/or neighboring cells may be configured as apathlossReferenceRS. A UE can be configured in MeasObjectNR to measureSSBs from the serving and/or neighbouring cells during the periodic SMTCwindows and/or CSI-RS resources from the serving and neighbouring cells.The performed measurements include SS-RSRP and CSI-RSRP (RSRPmeasurement on CSI-RS). In one example, once RSRP is calculated,obtaining the pathloss is straightforward as pathloss is given by thetransmit power minus RSRP. For positioning purposes, support configuringSSB and CSI-RS from the serving and the neighboring cells as apathlossReferenceRS.

The indication of spatialRelationInfo RS as above also apply indicatingthe pathlossReferenceRS to UE: pathlossReferenceRS from the serving orneighboring cells may be indicated in RRC signaling or message and atleast the reference signal resource ID and the Cell ID of thetransmitting serving or neighboring cell are required to enable the UEto uniquely identify the pathlossReferenceRS. The pathlossReferenceRS isconfigured in RRC and the pathlossReferenceRS configuration at leastincludes the DL reference signal (SSB or CSI-RS) resource ID and theCell ID of the transmitting serving/neighboring cell.

In positioning, the SRS target cell may be a neighboring cell. In such acase, a different fallback behavior may be defined when thepathlossReferenceRS is not configured or is configured but not detected.If a pathlossReferenceRS is not configured or is configured but notdetected, the UE may use the following detected SSB from the target cellas pathlossReferenceRS: if the target cell is a serving cell, thesubstitute pathlossReferenceRS is the SSB used to obtain MIB; or if thetarget cell is a neighboring cell, the substitute pathlossReferenceRS isthe SSB with the highest RSRP. Alternatively, if pathlossReferenceRS isconfigured but not detected or if pathlossReferenceRS is configured butnot detected and additionally no SSB from the corresponding target cellis detected, UE transmits the SRS with the maximum power.

To assist in understanding the present disclosure, FIGS. 1-3 are firstdescribed. FIGS. 1-3 provide examples of the network, system and devicesthat may be used to implement examples described in the presentdisclosure.

FIG. 1 illustrates an example wireless communication system 100 (alsoreferred to as wireless system 100) in which embodiments of the presentdisclosure could be implemented. In general, the wireless system 100enables multiple wireless or wired elements to communicate data andother content. The wireless system 100 may enable content (e.g., voice,data, video, text, etc.) to be communicated (e.g., via broadcast,narrowcast, user device to user device, etc.) among entities of thesystem 100. The wireless system 100 may operate by sharing resourcessuch as bandwidth. The wireless system 100 may be suitable for wirelesscommunications using 5G technology and/or later generation wirelesstechnology. In some examples, the wireless system 100 may alsoaccommodate some legacy wireless technology (e.g., 3G or 4G wirelesstechnology).

In the example shown, the wireless system 100 includes EDs 110, radioaccess networks (RANs) 120, a core network 130, a public switchedtelephone network (PSTN) 140, the internet 150, and other networks 160.In some examples, one or more of the networks may be omitted or replacedby a different type of network. Other networks may be included in thewireless system 100. Although certain numbers of these components orelements are shown in FIG. 1, any reasonable number of these componentsor elements may be included in the wireless system 100.

The EDs 110 are configured to operate, communicate, or both, in thewireless system 100. For example, the EDs 110 may be configured totransmit, receive, or both via wireless or wired communication channels.Each ED 110 represents any suitable end user device for wirelessoperation and may include such devices (or may be referred to) as a userequipment (UE), a wireless transmit/receive unit (WTRU), a mobilestation, a fixed or mobile subscriber unit, a cellular telephone, astation (STA), a machine type communication (MTC) device, a personaldigital assistant (PDA), a smartphone, a laptop, a computer, a tablet, awireless sensor, an internet of things (IoT) device, or a consumerelectronics device, among other possibilities. Future generation EDs 110may be referred to using other terms.

In FIG. 1, the RANs 120 include BSs 170. Although FIG. 1 shows each RAN120 including a single respective BS 170, it should be understood thatany given RAN 120 may include more than one BS 170, and any given RAN120 may also include base station controller(s) (BSC), radio networkcontroller(s) (RNC), relay nodes, elements, and/or devices. Each BS 170is configured to wirelessly interface with one or more of the EDs 110 toenable access to any other BS 170, the core network 130, the PSTN 140,the internet 150, and/or the other networks 160. For example, the BSs170 may also be referred to as (or include) a base transceiver station(BTS), a radio base station, a Node-B (NodeB), an evolved NodeB (eNodeBor eNB), a Home eNodeB, a gNodeB (gNB) (sometimes called anext-generation Node B), a transmission point (TP), atransmission/reception point (TRP), a site controller, an access point(AP), or a wireless router, among other possibilities. In some examples,the RAN 120 may be a Next Generation (NG) RAN, and the BS 170 may bereferred to as a NG-RAN node. In such cases, the BS 170 may be a gNB ora NG-eNB (which is an eNB that is connected to the NG core network via aNG interface). Future generation BSs 170 may be referred to using otherterms. Any ED 110 may be alternatively or additionally configured tointerface, access, or communicate with any other BS 170, the internet150, the core network 130, the PSTN 140, the other networks 160, or anycombination of the preceding. In some examples, a BS 170 may access thecore network 130 via the internet 150.

The EDs 110 and BSs 170 are examples of communication equipment that canbe used to implement some or all of the functionality and/or embodimentsdescribed herein. Any BS 170 may be a single element, as shown, ormultiple elements, distributed in the corresponding RAN 120, orotherwise. Each BS 170 transmits and/or receives wireless signals withina particular geographic region or area, sometimes referred to as a“cell” or “coverage area”. A cell may be further divided into cellsectors, and a BS 170 may, for example, employ multiple transceivers toprovide service to multiple sectors. In some embodiments there may beestablished pico or femto cells where the radio access technologysupports such. A macro cell may encompass one or more smaller cells. Insome embodiments, multiple transceivers could be used for each cell, forexample using multiple-input multiple-output (MIMO) technology. Thenumber of RANs 120 shown is exemplary only. Any number of RANs 120 maybe contemplated when devising the wireless system 100.

The BSs 170 communicate with one or more of the EDs 110 over one or moreUu wireless interfaces 190 (e.g., via radio frequency (RF), microwave,infrared (IR), etc.). The Uu interface 190 may also be referred to as aUu link, Uu connection, ED-BS link/connection/interface, or ED-networklink/connection/interface, for example. The EDs 110 may also communicatedirectly with one another (i.e., without involving the BS 170) via oneor more sidelink (SL) wireless interfaces 195. The SL interface may alsobe referred to as a SL connection, ED-ED link/connection/interface,device-to-device (D2D) link/connection/interface, or simply as SL, forexample. The wireless interfaces 190, 195 may utilize any suitable radioaccess technology. For example, the wireless system 100 may implementone or more channel access methods, such as code division multipleaccess (CDMA), time division multiple access (TDMA), frequency divisionmultiple access (FDMA), orthogonal FDMA (OFDMA), or single-carrier FDMA(SC-FDMA) for wireless communications.

The RANs 120 are in communication with the core network 130 to providethe EDs 110 with various services such as voice, data, and otherservices. The RANs 120 and/or the core network 130 may be in direct orindirect communication with one or more other RANs (not shown), whichmay or may not be directly served by core network 130, and may or maynot employ the same radio access technology. The core network 130 mayalso serve as a gateway access between (i) the RANs 120 or EDs 110 orboth, and (ii) other networks (such as the PSTN 140, the Internet 150,and the other networks 160). The core network 130 may also provideservices. For example, in the example of FIG. 1 the LMF 165 isimplemented in the core network 130 (e.g., at a backend server, or at adedicated location management unit). In other examples, the LMF 165 maybe implemented outside of the core network 130, for example at a BS 170.In the present disclosure, reference may be made to the LMF 165 as ashorthand for the network entity in which the LMF 165 is implemented.For example, the present disclosure may describe a message beingtransmitted to or from the LMF 165; in such instances, it should beunderstood that what is meant is that the message is being transmittedto or from the network entity (e.g., in the core network 130 or a BS170) in which the LMF 165 is implemented.

In addition, some or all of the EDs 110 may include functionality forcommunicating with different wireless networks over different wirelesslinks using different wireless technologies and/or protocols. Instead ofwireless communication (or in addition thereto), the EDs 110 maycommunicate via wired communication channels to a service provider orswitch (not shown), and to the Internet 150. PSTN 140 may includecircuit switched telephone networks for providing plain old telephoneservice (POTS). The Internet 150 may include a network of computers andsubnets (intranets) or both, and incorporate protocols, such as InternetProtocol (IP), Transmission Control Protocol (TCP), User DatagramProtocol (UDP). The EDs 110 may be multimode devices capable ofoperation according to multiple radio access technologies, andincorporate multiple transceivers necessary to support such.

FIGS. 2A and 2B illustrate example apparatuses that may implement themethods and teachings according to this disclosure. FIG. 2A illustratesan example BS 170, and FIG. 2B illustrates an example ED 110. Thesecomponents could be used in the wireless system 100 or in any othersuitable system.

As shown in FIG. 2A, the BS 170 includes at least one processing unit201. The processing unit 201 implements various processing operations ofthe BS 170. For example, the processing unit 201 could perform signalcoding, data processing, power control, input/output processing, or anyother functionality of the BS 170. The processing unit 201 may also beconfigured to implement some or all of the functionality and/orembodiments described in more detail herein. Each processing unit 201includes any suitable processing or computing device configured toperform one or more operations. Each processing unit 201 could, forexample, include a microprocessor, microcontroller, digital signalprocessor, field programmable gate array, or application specificintegrated circuit.

The BS 170 also includes at least one communication interface 202 forwired and/or wireless communications. Each communication interface 202includes any suitable structure for generating signals for wireless orwired transmission and/or processing signals received wirelessly or bywire. The BS 170 in this example includes at least one antenna 204 (inother examples, the antenna 204 may be omitted). Each antenna 204includes any suitable structure for transmitting and/or receivingwireless or wired signals. One or multiple communication interfaces 202could be used in the BS 170. One or multiple antennas 204 could be usedin the BS 170. In some examples, one or more antennas 204 may be anantenna array 204, which may be used to perform beamforming and beamsteering operations. Although shown as a single functional unit, a BS170 could also be implemented using at least one transmitter interfaceand at least one separate receiver interface.

The BS 170 further includes one or more input/output devices 206 orinput/output interfaces (such as a wired interface to the internet 150).The input/output device(s) 206 permit interaction with a user or otherdevices in the network. Each input/output device 206 includes anysuitable structure for providing information to or receiving informationfrom a user, such as a speaker, microphone, keypad, keyboard, display,or touchscreen, including network interface communications.

In addition, the BS 170 includes at least one memory 208. The memory 208stores instructions and data used, generated, or collected by the BS170. For example, the memory 208 could store software instructions ormodules configured to implement some or all of the functionality and/orembodiments described herein and that are executed by the processingunit(s) 201. Each memory 208 includes any suitable volatile and/ornon-volatile storage and retrieval device(s). Any suitable type ofmemory may be used, such as random access memory (RAM), read only memory(ROM), hard disk, optical disc, subscriber identity module (SIM) card,memory stick, secure digital (SD) memory card, and the like.

As shown in FIG. 2B, the ED 110 includes at least one processing unit250, at least one transmitter 252, at least one receiver 254, one ormore antennas 256, at least one memory 258, and one or more input/outputdevices or interfaces 266. The processing unit 250 implements variousprocessing operations of the ED 110, such as signal coding, dataprocessing, power control, input/output processing, or any otherfunctionality. The processing unit 250 can also be configured toimplement some or all of the functionality and/or embodiments describedherein. Each processing unit 250 includes any suitable processing orcomputing device configured to perform one or more operations. Eachprocessing unit 250 could, for example, include a microprocessor,microcontroller, digital signal processor, field programmable gatearray, or application specific integrated circuit.

Each transmitter 252 includes any suitable structure for generatingsignals for wireless or wired transmission. Each receiver 254 includesany suitable structure for processing signals received wirelessly or bywire. Although shown as separate components, at least one transmitter252 and at least one receiver 254 could be combined into a transceiver.Each antenna 256 includes any suitable structure for transmitting and/orreceiving wireless or wired signals. Although a common antenna 256 isshown here as being coupled to both the transmitter 252 and the receiver254, one or more antennas 256 could be coupled to the transmitter(s)252, and one or more separate antennas 256 could be coupled to thereceiver(s) 254. In some examples, one or more antennas 256 may be anantenna array, which may be used for beamforming and beam steeringoperations. Each memory 258 includes any suitable volatile and/ornon-volatile storage and retrieval device(s) such as those describedabove with respect to FIG. 2A. The memory 258 stores instructions anddata used, generated, or collected by the ED 110. For example, thememory 258 could store software instructions or modules configured toimplement some or all of the functionality and/or embodiments describedherein and that are executed by the processing unit(s) 250.

Each input/output device/interface 266 permits interaction with a useror other devices in the network. Each input/output device/interface 266includes any suitable structure for providing information to orreceiving/providing information from a user, including network interfacecommunications.

It is contemplated that the communication system 100 as illustrated inFIG. 1 may support a New Radio (NR) cell, which also may be referred toas hyper cell. Each NR cell includes one or more BSs 170 using the sameNR cell ID. The NR cell ID is a logical assignment to all physical BSs170 of the NR cell and may be carried in a broadcast synchronizationsignal. The NR cell may be dynamically configured. The boundary of theNR cell may be flexible and the system dynamically adds or removes BSs170 to or from the NR cell. Any number of NR cells may be implemented inthe communication system 100.

For example, FIG. 3 illustrates two neighboring NR cells in an examplecommunication system, in which the examples described in this disclosuremay be implemented. It should be noted that, although referred to as NRcells (or more simply cells), a cell may be understood to mean an NG-RANnode (e.g., gNB or eNB that is connected with the NG network) in someexamples. Accordingly, any reference to a cell in the present disclosureshould also be understood to include reference to an NG-RAN node. FIG. 3shows two neighboring NR cells 382, 384, however it should be understoodthat there may be more than two NR cells, and there may be NR cells thatare not direct neighbors of each other. In the example shown, each NRcell 382, 384 includes multiple BSs 170. For example, the first NR cell382 includes BSs 170 a-170 f, which are all assigned the same first NRcell ID identifying the first NR cell 382. Similarly, the second NR cell384 includes BSs 170 g-170 l, which are all assigned the same second NRcell ID identifying the second NR cell 384. In this example, the firstNR cell 382 is the serving cell for the ED 110. Specifically, two BSs170 a, 170 b are shown to be communicating with the ED 110. It should beunderstood that other BSs 170 in the first NR cell 382 may communicatewith the ED 110. In this example, the second NR cell 384 is anon-serving cell (or neighboring cell) with respect to the ED 110.

One BS 170 m may be shared between the two NR cells 382, 384. Forexample, the BS 170 m is assigned to one of the two NR cells 382, 384 atdifferent times, frequencies or spatial directions. The system (e.g., atthe core network) may assign the BS 170 m to one of the two NR cells382, 384 by switching the assigned NR cell ID for the BS 170 m betweenthe NR cell IDs associated with the respective NR cells 382 and 384. Insome examples, the shared BS 170 m can help to reduce interference forany EDs located at the boundary between the two NR cells 382, 384. EDsthat are located near the boundaries of the two NR cells 382, 384 mayexperience less handovers because the shared BS 170 m is associated witheither NR cell 382, 384 at different times, frequencies or spatialdirections. Further, as an ED moves between the NR cells 382, 384, thetransition is a smoother experience for the user. For example, thenetwork may change the NR cell ID assigned to the shared BS 170 m totransition a ED moving between NR cells 382, 384. There may be anynumber (including zero) of shared BSs in the system.

The NR cell topology may be updated by the system (e.g., at the corenetwork), for example adapt to changes in network topology, loaddistribution, and/or ED distribution. For example, if the concentrationof EDs increases in one region, the system may dynamically expand the NRcell to include BSs near the higher concentration of EDs. For example,the system may expand the NR cell to include other BSs if theconcentration of EDs located at the edge of the NR cell increases abovea certain threshold. As another example, the system may expand a NR cellto include a greater concentration of EDs located between two NR cells.In some examples, if the traffic load increases significantly at oneregion, the system may also expand the NR cell associated with theregion to include BSs for the increased traffic load. For example, ifthe traffic load of a portion of the network exceeds a predeterminedthreshold, the system may change the assigned NR cell ID of one or moreBSs that are transmitting to the impacted portion of the network.

In some examples, the system can change the association of a BS withdifferent NR cells periodically, such as every 1 millisecond. Such aflexible NR cell formation mechanism may enable EDs to be better servedby BSs and may help to reduce or eliminate the number of cell edge EDs.

The system may apply BS selection techniques to minimize intra-NR cellinterference and inter-NR cell interference. In an example, a BS sends adownlink CSI-RS. Some pilot (also known as reference signal) ports maybe defined such that the ED can measure the channel state informationand report it back to the network. A CSI-RS port is a pilot port definedas a set of known symbols from a sequence transmitted over knownresource elements (for example OFDM resource elements) for the ED tomeasure the channel state. An ED assigned to measure a particular CSI-RSport can measure the transmitted CSI-RS sequence, measure the associatedchannel state and report it back to the network. The network, such as acontroller, may select the best BS(s) for all served EDs based on thedownlink measurements. In another example, a BS detects an uplink SRSsequence from a ED in the configured time-frequency resources. Forexample, Constant Amplitude Zero Auto Correlation (CAZAC) sequences suchas Zadoff-Chu (ZC) sequences can be used as base sequences for SRS. TheBS reports a measurement of the detected uplink SRS sequence to thenetwork, such as a controller. The network controller then selects theoptimal BS(s) for all served ED based on the measurements.

FIG. 4 illustrates an example signal flow diagram that illustrates anexample SRS measurement, in accordance with examples described herein.

FIG. 4 shows signaling performed by the ED 110, a BS in a serving cell382 (only one serving cell is shown in this figure, but it should beunderstood that multiple serving cells may be involved in the process),BSs in M non-serving cells (only non-serving cell 1 384 a andnon-serving cell M 384 m are shown; generally referred to as non-servingcell 384), and the LMF 135. For simplicity, the present disclosurerefers to signals being transmitted to or from a serving cell or anon-serving cell; however, it should be understood that signaling to andfrom a cell is handled by one or more BSs of that cell.

In a step 410, the serving cell 382 may configure a TF RS per SRSresource or a PL RS per SRS resource set, or both. Note that each SRSresource set is comprised of at least one SRS resource. Also, at leastone of the M non-serving cells 384 may configure a TF RS per SRSresource or a PL RS per SRS resource set, or both, either without anycoordination with the serving cell or in coordination with the servingcell. In some examples, a non-serving cell 384 may send SRS resource setconfigurations that include the configurations of the TF RSs and/or PLRSs to the serving cell 382, which is in communication with the ED 110,using a backhaul channel between the serving cell 382 and thenon-serving cell 384.

In a step 420, the serving cell 382 sends the configurations of the SRSresource sets for the serving cell 382 and any configurations of the SRSresource sets received from the non-serving cells 384 to the ED 110.Note that, in some examples, the configurations of the PL RS and/or TFRS may alternatively be sent to the ED 110 from the LMF 135. Thisprocedure is not shown in FIG. 4. Some examples where the LMF 135 sendsthe PL RS and/or TF RS configurations to the ED 110 will be discussedlater in this disclosure.

In a step 430, the serving cell 382 and the non-serving cells 384transmit the configured TF RS or PL RS, or both, to the ED 110. The BSsin the serving cell 382 and/or the non-serving cells 384 may send the TFRS in multiple beam directions. Because the ED 110 has received the TFRS or PL RS configuration beforehand (in step 420), the ED 110 is ableto detect at least one of the DL PL RS and DL TF RS beam(s) that is(are)transmitted from the serving cell 382 and/or the non-serving cells 384.To detect each DL TF RS or DL PL RS, or both, the ED 110 typically usesspatial domain receive beam sweeping and determines which spatial domainreceive beam is best to receive the DL TF RS from a serving cell 382 ornon-serving cell 384. The ED 110 then uses the same “best” spatialdomain receive beam as the spatial domain transmission beam fortransmission of the SRS that is intended to be received at therespective serving cell 402 or non-serving cell 384. The ED 110 may useUL/DL channel reciprocity in determining the spatial domain transmissionfilter.

In a step 440, the ED 110 uses the received TF RSs to obtain the spatialtransmission filter of the corresponding SRS resource sets and/or the PLRSs to determine the transmit power of the corresponding SRS resourcesets and transmits the SRS resource sets using the obtained transmissionfilters and transmit powers.

In a step 450, the BSs of the serving cell 382 and the non-serving cells384 may send the measurements that are obtained from the received SRSsback to the LMF 135 to process. For example, the LMF 135 may use thereceived information to determine the position of the ED 110.

Each of the respective steps may take place within a respective timeframe, which are periods of time that are allotted within thecommunication network allowing the indicated signals to be transmittedand received. The signals described for a respective step (which maytake place in a respective time frame) may be transmittedsimultaneously, or sequentially, for the serving cell and the variousnon-serving cells.

In one example, the present disclosure describes some exampleconfiguration details of a PL PRS or TF PRS. The PL PRS or TF PRSconfiguration information in these examples are transmitted to the ED bythe serving cell or the LMF.

In examples described herein, the PRS may be configured to be used as aTF RS or a PL RS transmitted from a non-serving cell or the serving cellto the ED. The PL PRS configuration or TF PRS configuration providesinformation to the ED to enable the ED to properly receive a PL PRS orTF PRS from a non-serving cell or a serving cell. Conventionally, PRShas not been used for the purpose of determining PL and/or TF.

The PL PRS configuration or TF PRS configuration may be sent to the EDby serving cell (e.g., using RRC signaling) or by the LMF (e.g., usingLTE positioning protocol (LPP)), for example. For example, the servingcell or the LMF may receive configuration information from thenon-serving cell (e.g., the non-serving cell may communicateconfiguration information to the serving cell using Xn ApplicationProtocol (XnAP) or F1 Application Protocol (F1AP); or the non-servingcell may communicate configuration information to the LMF using NewRadio Positioning Protocol A (NRPPa); or the non-serving cell maycommunicate configuration information to the LMF using NRPPa and thenthe LMF may in turn communicate the configuration information to theserving cell using NRPPa). Generally, it should be understood that incommunications between the LMF and a cell (serving or non-serving cell)using NRPPa, the term “cell” may be more specifically understood to meana NG-RAN node (e.g., a gNB or NG-eNB). Some details of how configurationinformation may be communicated by the non-serving cell are furtherdescribed in examples 5 below.

In the transmitted PL PRS or TF PRS configuration, at least the PRS ID(or PRS configuration index) is included. The PRS ID may be used toidentify the PRS transmitted from the non-serving cell or serving cellas being used for determining PL or TF. For example, the ED may beconfigured to recognize PRS ID #7 as being a PRS for PL purposes. It maybe noted that, conventionally, PRS ID has not been communicated usingRRC signaling. Also, in Rel. 15 NR, PL PRS and TF PRS are not supported.

In some examples, one of more of the following fields are also includedin the PL PRS or TF PRS configuration information. The configurationinformation may include a field indicating the physical cell ID (PCID)of the cell (e.g., non-serving cell) that will send the PL PRS or TFPRS. The configuration information may include a field indicating theconfiguration of a SSB, CSI-RS or PRS that is quasi colocation-Type D(QCL-D) with the PL PRS or TF PRS (discussed further below). Two signalsthat are QCL-D (as defined according to 3GPP standard) means that thetwo signals share common spatial receiver parameters. The configurationinformation may include a field indicating a New Radio AbsoluteRadio-Frequency Channel Number (NR ARFCN) value to determine the PL PRSor TF PRS location in the frequency domain. The configurationinformation may include field(s) indicating the bandwidth, slot offset,frame offset and/or symbol offset of the PL PRS or TF PRS. Theconfiguration information may include a field indicating the number ofantenna ports of the PL PRS or TF PRS. The configuration information mayinclude a field indicating the number of DL frame that the PL PRS or TFPRS is to be transmitted at. The configuration information may includefield(s) indicating the PL PRS or TF PRS muting configuration and/orhopping configuration. The configuration information may include a fieldindicating the number of available narrowband for PL PRS or TF PRS. Theconfiguration information may also include field(s) indicating aperiodicity and offset for the PL PRS or TF PRS. The configurationinformation may also include field(s) indicating a scrambling ID andoffset for the PL PRS or TF PRS.

As mentioned above, the PL PRS or TF PRS configuration information mayinclude a field indicating the configuration of the SSB, CSI-RS or PRSthat is QCL-D with the PL PRS or TF PRS. It is necessary for the ED tobe informed that the PL PRS or TF PRS is being transmitted using aparticular transmission beamformer, to enable the ED to properly detectthe PL PRS or TF PRS. A SSB, CSI-RS or PRS (which is already configuredfor the ED) that is QCL-D with the PL PRS or TF PRS can be used as asubstitute for locating the PL PRS or TF PRS. The ED may use the samereceive beamformer configuration, which is already known for the SSB,CSI-RS or PRS, to detect the PL PRS or TF PRS. In other words, theconfiguration of the SSB, CSI-RS or PRS that is QCL-D with the PL PRS orTF PRS can be indicated to the ED, to enable the ED to use thatconfiguration to detect the PL PRS or TF PRS.

The configuration of the SSB, CSI-RS or PRS that is QCL-D with the PLPRS or TF PRS may be indicated using at least the SSB index, CSI-RSindex or PRS index, respectively. The configuration of the SSB, CSI-RSor PRS may include one or more of the following fields. For example, theconfiguration may include a field indicating the PCID of the cellassociated with the QCL-D SSB, CSI-RS or PRS; may include a fieldindicating a NR ARFCN value to determine the QCL-D SSB, CSI-RS or PRSlocation in the frequency domain; and/or may include a field indicatingtime domain reference(s) to determine the QCL-D SSB, CSI-RS or PRSlocation in the time domain.

The example described above provide configuration details that enablethe ED to detect a PRS originating outside of the serving cell, for thepurpose of determining PL and/or TF, in order to enable transmission ofSRS to a non-serving cell.

FIG. 5 is a flowchart illustrating an example method 500 that may beperformed in accordance with the example described above. The method 500may be implemented in the ED (e.g., using a processing unit of the EDexecuting instructions stored in a memory of the ED).

At 505, the ED receives configuration information for the PL PRS or TFPRS from the serving cell or the LMF. The configuration information mayinclude the fields described above, for example.

At 510, using the configuration information the ED is enabled to receivethe PL PRS or TF PRS from the serving cell or the non-serving cell. Inexamples in which the configuration information includes informationabout another configured reference signal (e.g., another configured SSB,CSI-RS or PRS) that is QCL-D with the PRS, the ED is enabled to receivethe PL PRS or TF PRS based on the configuration for the configuredreference signal.

At 515, the ED transmits a SRS to the serving cell or the non-servingcell, based on PL and/or TF determined from the received PL PRS or TFPRS.

In another example, the present disclosure describes some exampleconfiguration details of a PL SSB, TF SSB, PL CSI-RS, or TF CSI-RS.Configurations of the PL SSB, TF SSB, PL CSI-RS, or TF CSI-RS in theseexamples are transmitted to the ED by the serving cell or the LMF.

In examples described herein, a SSB or CSI-RS may be configured to beused as a TF RS or a PL RS transmitted from the non-serving cell to theED. The PL SSB, TF SSB, PL CSI-RS, or TF CSI-RS configuration providesinformation to the ED to enable the ED to properly receive a PL SSB, TFSSB, PL CSI-RS, or TF CSI-RS from a non-serving cell. The ED may thenuse the received PL SSB, TF SSB, PL CSI-RS, or TF CSI-RS to determine PLand/or TF for transmission of a SRS to the non-serving cell.

The configuration information may be sent to the ED by the serving cellor by the LMF using any suitable method (e.g., RRC signaling from theserving cell, or via LPP from the LMF). For example, the serving cell orthe LMF may receive configuration information from the non-serving cell(e.g., the non-serving cell may communicate configuration information tothe serving cell using Xn Application Protocol (XnAP) or F1AP; or thenon-serving cell may communicate configuration information to the LMFusing New Radio Positioning Protocol A (NRPPa); or the non-serving cellmay communicate configuration information to the LMF using NRPPa andthen the LMF may in turn communicate configuration information to theserving cell using NRPPa). As explained above, it should be understoodthat in communications between the LMF and a cell (serving ornon-serving cell) using NRPPa, the term “cell” may be more specificallyunderstood to mean a NG-RAN node (e.g., a gNB or NG-eNB). Some detailsof how configuration information may be communicated by the non-servingcell are further described in examples below.

Configuration information for the PL SSB or TF SSB is described first.

In some examples, the configuration PL SSB or TF SSB may include the SSBID and the PCID of the cell (e.g., non-serving cell) transmitting the PLSSB or TF SSB. In some examples, the configuration PL SSB or TF SSB mayfurther include the configuration of a PRS, SSB or CSI-RS that is QCL-Dwith the PL SSB or TF SSB. As previously explained, a PRS, SSB or CSI-RSthat is QCL-D with the PL SSB or TF SSB may be used as a substitute forlocating the PL SSB or TF SSB. The configuration of the RS (e.g., PRS,SSB or CSI-RS) that is QCL-D with the PL SSB or TF SSB may include atleast the index of that QCL-D RS. In some examples, the configuration ofthe QCL-D RS may further include one or more of the following fields.The configuration of the QCL-D RS may include a field indicating thePCID of the cell associated with the QCL-D RS; a field indicating a NRARFCN value to determine the QCL-D RS location in the frequency domain;and/or a field indicating time domain reference(s) to determine theQCL-D RS location in the time domain.

For example, it may be possible to configure the spatial relationinformation (spatialRelationInfo) RS from the set of DL RSs that arealready detected by the ED and/or configured to the ED for potentiallyother purposes. This includes the detected SSBs from the serving ornon-serving cells during, for instance, the initial access, configuredCSI-RS resource from the serving cell, configured SSBs or CSI-RSresources in measurement object NR (MeasObjectNR) from the serving ornon-serving cells, or configured DL PRS resources for the referencesignal time difference (RSTD) or the ED “receiver−transmitter” timedifference measurements. In general, and considering that thespatialRelationInfo RS can be received by the ED from a non-servingcell, the spatialRelationInfo RS configuration may indicate allparameters that enable the ED to detect a DL RS. Depending on the DL RStype (e.g., SSB, CSI-RS, or DL PRS), this information may includereference time and frequency points, time and frequency domain resourcemapping parameters, periodicity and offset, PCID, resource ID,scrambling ID, and possibly QCL-D properties.

To uniquely identify the spatialRelationInfo RS, it may be sufficient toindicate to the ED the DL RS resource ID and the PCID of thecorresponding serving or neighboring cell. For example, when thespatialRelationInfo SSB (used as a TF SBB) or pathlossReference SSB(used as a PL SSB) are already configured for other purposes, the SSBmay be indicated in RRC using SSB index and the PCID of the serving ornon-serving cell transmitting the SSB. The spatialRelationInfo RS may beconfigured in RRC and the spatialRelationInfo RS configuration mayinclude the resource ID of the DL RS (e.g., SSB, CSI-RS, or DL-PRS) andthe cell ID of the transmitting serving or non-serving cell.

In some examples, LMF may send the configurations of the DL PRS resourceof the serving and/or non-serving cell to the ED using LPP. The servingcell may be transparent to the DL PRS configurations of the non-servingcells. If the DL PRS that is used as a spatialRelationInfo RS is alreadyconfigured to the ED by the LMF (e.g., for enabling the RSTD or the ED's“receiver−transmitter” time difference measurements), the serving cellmay need to indicate the DL PRS resource ID and the PCID of thecorresponding cell to configure the DL PRS as the spatialRelationInfo RSin the SRS-Config information element (IE) in RRC. The DL PRS resourceID and the PCID of the non-serving cell can be provided by the LMF tothe serving cell using, for example, NRPPa (particularly in the casewhere the serving cell is a NG-RAN node).

Configuration information for the PL CSI-RS or TF CSI-RS is nowdescribed.

In some examples, the configuration PL CSI-RS or TF CSI-RS may includeonly the CSI-RS ID and the PCID of the cell (e.g., non-serving cell)transmitting the PL CSI-RS or TF CSI-RS. In some examples, theconfiguration PL CSI-RS or TF CSI-RS may further include theconfiguration of a PRS, SSB or CSI-RS that is QCL-D with the PL CSI-RSor TF CSI-RS. As previously explained, a PRS, SSB or CSI-RS that isQCL-D with the PL SSB or TF SSB may be used as a substitute for locatingthe PL CSI-RS or TF CSI-RS. The configuration of the RS (e.g., PRS, SSBor CSI-RS) that is QCL-D with the PL CSI-RS or TF CSI-RS may include atleast the index of that QCL-D RS. In some examples, the configuration ofthe QCL-D RS may further include one or more of the following fields.The configuration of the QCL-D RS may include a field indicating thePCID of the cell associated with the QCL-D RS; a field indicating a NRARFCN value to determine the QCL-D RS location in the frequency domain;and/or a field indicating time domain reference(s) to determine theQCL-D RS location in the time domain.

Similar to the above discussion in the context of spatialRelationInfoRS, it may be possible to configure the pathlossReferenceRS from the setof DL RSs that are already detected by the ED and/or configured to theED for potentially other purposes. The pathlossReferenceRS, transmittedfrom the serving or non-serving cell, may be indicated to the EDpathlossReferenceRS in RRC, for example. The indication in RRC mayinclude the resource ID of the DL RS (SSB or CSI-RS) and the PCID of thetransmitting serving or non-serving cell, to enable the ED to uniquelyidentify the pathlossReferenceRS.

As discussed above, in some examples it is possible to configure the EDto detect a DL RS for the purpose of PL or TF, where the fullconfiguration information of the DL RS was previously provided to the EDfor another purpose. The previously provided full configurationinformation may include, for example in the case where the DL RS is aPRS, the resource ID of the PRS, the cell ID of the transmitting servingor non-serving sell, a field indicating the configuration of anotherreference signal (e.g., SSB or PRS) that is QCL-D with the PRS, a fieldindicating the NR ARFCN value to determine the location of the PRS inthe frequency domain, bandwidth, slot offset, frame offset, symboloffset, muting configuration, periodicity and offset, and scrambling ID.In examples where the DL RS is a SSB, full configuration information maybe a set of parameters providing sufficient information to locate theSSB in the time-frequency domain, the SSB index, and the associated cellID of the transmitting serving or non-serving cell.

The example described above may be relatively simple to implement in thecontext of current methodologies. For example, if a DL RS (e.g., SSB orCSI-RS) has already been configured to the ED for other purposes and/orhas already been detected by the ED, only a small number of fields(e.g., as few as two fields to indicate the ID of the SSB or CSI-RS, andto indicate the PCID of the originating cell) need to be indicated tothe ED to enable the ED to recognize which of the already configured ordetected DL RSs should be used as a PL SSB, TF SSB, PL CSI-RS, or TFCSI-RS.

FIG. 6 is a flowchart illustrating an example method 600 that may beperformed in accordance with the example described above. The method 600may be implemented in the ED (e.g., using a processing unit of the EDexecuting instructions stored in a memory of the ED).

At 605, the ED receives configuration information for the PL SSB, TFSSB, PL CSI-RS, or TF CSI-RS from the serving cell or the LMF. Theconfiguration information may include the fields described above (e.g.,including the SSB ID or CSI-RS ID, and the PCID), for example.

At 610, using the configuration information the ED is enabled to receivethe PL SSB, TF SSB, PL CSI-RS, or TF CSI-RS from the non-serving cell.In examples in which the configuration information includes informationabout another configured reference signal (e.g., another configured SSB,CSI-RS or PRS) that is QCL-D with the PL SSB, TF SSB, PL CSI-RS, or TFCSI-RS, the ED is enabled to receive the PL SSB, TF SSB, PL CSI-RS, orTF CSI-RS based on the configuration for the configured referencesignal.

At 615, the ED transmits a SRS to the non-serving cell, based on PLand/or TF determined from the received PL SSB, TF SSB, PL CSI-RS, or TFCSI-RS.

In another example, the present disclosure describes example fallbackprocedures that may be used by the ED in the event that the PL CSI-RS,TF CSI-RS, PL PRS or TF PRS is not obtained/detected by the ED, or thePL CSI-RS, TF CSI-RS, PL PRS or TF PRS is not configured to the ED.After the ED has received configuration information for the PL CSI-RS,TF CSI-RS, PL PRS or TF PRS (e.g., as described above), the ED mayexpect to receive the respective PL CSI-RS, TF CSI-RS, PL PRS or TF PRS,for determining PL or TF of a SRS that is to be transmitted to anon-serving cell or a serving cell. However, the ED may fail to obtainor detect the expected PL CSI-RS, TF CSI-RS, PL PRS or TF PRS (e.g., dueto changing channel conditions, ED receiver circuit failure, unexpectedinterference, or other reasons). In such a case, and also in the casethat PL CSI-RS, TF CSI-RS, PL PRS or TF PRS is not configured to the ED,it would be desirable to provide a fallback procedure, to enable the EDto proceed with transmission of the SRS to the non-serving cell, even inthe absence of a detected PL CSI-RS, TF CSI-RS, PL PRS or TF PRS or inthe absence of a configured PL CSI-RS, TF CSI-RS, PL PRS or TF PRS.

In some examples, the ED may determine that the fallback procedureshould be used after the expected PL CSI-RS, TF CSI-RS, PL PRS or TF PRShas not been received in the configured time and frequency location orPL CSI-RS, TF CSI-RS, PL PRS or TF PRS is not configured to ED.

In some examples, if PL PRS or TF PRS has been configured but thefallback procedure has been triggered (e.g., the PL PRS or TF PRS hasnot been detected by the ED within the expected time or timeframe) or PLPRS or TF PRS is not configured to ED, then the ED may use a detectedSSB or a detected CSI-RS as a substitute PL RS or TF RS.

In some examples, the ED may use a detected SSB originating from thecell (e.g., the non-serving cell) that was configured (e.g., indicatedby the PCID included in the configuration information, as discussedabove) for the expected PL PRS or TF PRS as a substitute PL RS or TF RS,respectively. In the event that the ED detects more than one SSBoriginating from the configured cell, the ED may select one of themultiple SSBs as a substitute PL RS or TF RS based on any suitablecriterion. For example, the ED may select the SSB with the highestreference signal received power (RSRP) as a substitute PL RS or TF RS.In some examples, in the event that the ED detects more than one SSBoriginating from the configured cell, the ED may use any suitabletechnique to calculate PL based on the received power from the detectedSSBs originating from the configured cell, or the ED may use anysuitable selection criterion to determine which of the detected SSBsshould be used as a substitute TF RS.

In some examples, the ED may use any of the methods described in theabove paragraph when the SRS is configured to be received at anon-serving cell (e.g., PCID included in the configuration informationis a PCID of a non-serving cell) and the ED may use the SSB that wasused to obtain system information (e.g., MIB and/or System InformationBlock Type 1 (SIB1)) as a substitute PL RS or TF RS when the SRS isconfigured to be received at a serving cell (e.g., PCID included in theconfiguration information is a PCID of the serving cell).

In some examples, the ED may use a detected CSI-RS originating from thecell (e.g., the non-serving cell) that was configured (e.g., indicatedby the PCID included in the configuration information, as discussedabove) for the expected PL PRS or TF PRS as a substitute PL RS or TF RS,respectively. In the event that the ED detects more than one CSI-RSoriginating from the configured cell, the ED may select one of themultiple CSI-RSs as a substitute PL RS or TF RS based on any suitablecriterion. For example, the ED may select the CSI-RS with the highestRSRP as a substitute PL RS or TF RS. In some examples, in the event thatthe ED detects more than one CSI-RS originating from the configuredcell, the ED may use any suitable technique to calculate PL based on thereceived power from the detected CSI-RSs originating from the configuredcell, or the ED may use any suitable selection criterion to determinewhich of the detected CSI-RSs should be used as a substitute TF RS.

In some examples, if a PL CSI-RS or TF CSI-RS has been configured butthe fallback procedure has been triggered (e.g., the PL CSI-RS or TFCSI-RS has not been detected by the ED within the expected time ortimeframe) or a PL CSI-RS or TF CSI-RS has not been configured, then theED may use a detected SSB or a detected PRS as a substitute PL RS or TFRS.

In some examples, the ED may use a detected SSB originating from thecell (e.g., the non-serving cell) that was configured (e.g., indicatedby the PCID included in the configuration information, as discussedabove) for the expected PL CSI-RS or TF CSI-RS as a substitute PL RS orTF RS, respectively. In the event that the ED detects more than one SSBoriginating from the configured cell, the ED may select one of themultiple SSBs as a substitute PL RS or TF RS based on any suitablecriterion. For example, the ED may select the SSB with the highestreference signal received power (RSRP) as a substitute PL RS or TF RS.In some examples, in the event that the ED detects more than one SSBoriginating from the configured cell, the ED may use any suitabletechnique to calculate PL based on the received power from the detectedSSBs originating from the configured cell, or the ED may use anysuitable selection criterion to determine which of the detected SSBsshould be used as a substitute TF RS.

In some examples, the ED may use any of the methods described in theabove paragraph when the SRS is configured to be received at anon-serving cell (e.g., PCID included in the configuration informationis a PCID of a non-serving cell) and the ED may use the SSB that wasused to obtain system information (e.g., MIB and/or System InformationBlock Type 1 (SIB1)) as a substitute PL RS or TF RS when the SRS isconfigured to be received at a serving cell (e.g., PCID included in theconfiguration information is a PCID of the serving cell).

In some examples, the ED may use a detected PRS originating from thecell (e.g., the non-serving cell) that was configured (e.g., indicatedby the PCID included in the configuration information, as discussedabove) for the expected PL CSI-RS or TF CSI-RS as a substitute PL RS orTF RS, respectively. In the event that the ED detects more than one PRSoriginating from the configured cell, the ED may select one of themultiple PRSs as a substitute PL RS or TF RS based on any suitablecriterion. For example, the ED may select the PRS with the highest RSRPas a substitute PL RS or TF RS. In some examples, in the event that theED detects more than one PRS originating from the configured cell, theED may use any suitable technique to calculate PL based on the receivedpower from the detected PRSs originating from the configured cell, orthe ED may use any suitable selection criterion to determine which ofthe detected PRSs should be used as a substitute TF RS.

In some examples, in the event the ED does not detect the expected PLPRS, TF PRS, PL CSI-RS or TF CSI-RS or PL PRS, TF PRS, PL CSI-RS or TFCSI-RS is not configured for the ED, the ED may use the SSB that wasused to obtain system information (e.g., MIB and/or System InformationBlock Type 1 (SIB1)) as a substitute PL RS or TF RS. In other examples,the ED may use, as a substitute, the PL SSB of the SRS Resource set thatis configured for the serving cell (e.g., the PL SSB of the SRS resourceset whose configuration includes the PCID of the serving cell t) as thePL RS of the SRS Resource set for the SRS transmission to thenon-serving cell.

In some examples, in the event the ED does not detect the expected PLPRS, TF PRS, PL CSI-RS or TF CSI-RS or PL PRS, TF PRS, PL CSI-RS or TFCSI-RS is not configured for the ED, the ED may use any suitabletechnique to calculate PL. In some examples, in the event the ED doesnot detect the expected PL PRS, TF PRS, PL CSI-RS or TF CSI-RS, the EDmay also use any suitable technique to perform beamforming for the SRStransmission to the non-serving cell. For example, the ED may simplyassume that the PL or TF is the same as for the current serving cell.

In some examples, in the event the ED does not detect the expected PLPRS, TF PRS, PL CSI-RS or TF CSI-RS or PL PRS, TF PRS, PL CSI-RS or TFCSI-RS is not configured for the ED, the ED may not transmit thecorresponding SRS Resource (set).

The above example address the situation in which the PL CSI-RS, TFCSI-RS, PL PRS, or TF PRS that was configured is not obtained ordetected by the ED or the situation in which PL PRS, TF PRS, PL CSI-RSor TF CSI-RS is not configured for the ED. The example provide variousfallback procedures that may be used by the ED as a substitute forcalculation of DL pathloss and/or the SRS spatial domain filter.

FIG. 7 is a flowchart illustrating an example method 700 that may beperformed in accordance with the example described above. The method 700may be implemented in the ED (e.g., using a processing unit of the EDexecuting instructions stored in a memory of the ED).

Optionally, at 705, the ED receives configuration information for anexpected PL PRS, TF PRS, PL CSI-RS, or TF CSI-RS from the serving cellor the LMF. The configuration information may include the fieldsdescribed above (e.g., with respect to examples above), for example.

At 710, when the expected PL PRS, TF PRS, PL CSI-RS or TF CSI-RS is notdetected (e.g., expected PL PRS, TF PRS, PL CSI-RS or TF CSI-RS has notbeen detected in the configured time or timeframe), or if PL PRS, TFPRS, PL CSI-RS or TF CSI-RS has not been configured for the ED, the EDuses another detected RS (e.g., as described above) as a substitute PLRS or TF RS. The ED determines PL and/or TF using the substitute PL RSor TF RS.

At 715, the ED transmits a SRS to the non-serving cell, based on PLand/or TF determined using the substitute PL RS or TF RS.

In another example, the present disclosure describes examples thatenable the ED to receive the configuration of PL RS or TF RS from theLMF. The example further include examples that enable the LMF to acquirePL RS or TF RS configuration details from serving and/or non-servingcell(s). These examples enable the ED to receive configurationinformation that originates from a cell, but transmitted via the LMF.

In some examples, the ED may receive the configuration of PL RS (e.g.,PL SSB, PL CSI-RS or PL PRS) and/or TF RS (e.g., TF SSB, TF CSI-RS or TFPRS) from the LMF, for example via LPP.

In some examples, the LMF may request configuration information of thePL RS and/or TF RS from each respective cell (e.g., each cell thattransmits the PL RS and/or TF RS), for example using NRPPa (e.g., whereeach respective cell is a NG-RAN node). The request transmitted by theLMF may include one or more suggested values for one or moreconfiguration fields of the PL RS and/or TF RS (e.g., may includesuggested values for QCL-D information or bandwidth). The cell(s) towhich the LMF transmits this request may include the serving cell and/ornon-serving cell(s) of the ED. The suggested value(s) included by theLMF in the transmitted request may or may not be overridden by therespective cell.

In some examples, the respective cell(s) may, in response to the requestfrom the LMF, send the requested configuration information of the PL RSand/or TF RS to the LMF, for example using NRPPa (e.g., where eachrespective cell is a NG-RAN node).

In some examples, a cell (e.g., serving cell or non-serving cell) maytransmit the configuration information of the PL RS and/or TF RS to theLMF as part of the cell initiation process, in the absence of anexplicit request from the LMF.

The example provides various mechanisms for communicating configurationinformation of the PL RS and/or TF RS between cells and the LMF. The EDmay then receive the configuration information, which originated from acell, via the LMF.

FIG. 8A is a flowchart illustrating an example method 800 that may beperformed in accordance with the example described above. The method 800may be implemented in the LMF (e.g., at the network entity thatimplements the LMF in the core network or elsewhere in the system).

FIG. 8B is an example signal flow diagram illustrating signaling betweennetwork entities, which may be used to implement the example describedabove. FIG. 8B shows signaling performed by the ED 110, a first BS 170 ain a serving cell (also referred to as the serving cell BS 170 a), asecond BS 170 b in a non-serving cell (also referred to as thenon-serving cell BS 170 b), and the LMF 135. For simplicity, the presentdisclosure may refer to signals being transmitted to or from a servingcell or a non-serving cell; however, it should be understood thatsignaling to and from a cell is handled by the respective BS of thatcell. For simplicity, only one serving and one non-serving cell isshown. However, it should be understood that there may be more than oneserving cell and/or more than one non-serving cell.

FIGS. 8A and 8B will be discussed together, for ease of understanding.

At 805, optionally, the LMF transmits a request 855 to one or more cells(e.g., serving cell BS 170 a and/or non-serving cell BS(s) 170 b)requesting configuration information for PL RS and/or TF RS (alsoreferred to generally as a DL RS). The request 855 may be transmittedusing NRPPa, for example where each cell is a NG-RAN node. In someexamples, the cell(s) may transmit configuration information withoutbeing requested by the LMF (e.g., at cell initiation). The request mayinclude a suggested value for a configuration field.

At 810, the LMF receives a message 860 from the BSs 170 a, 170 b of eachrespective cell, the message including configuration information for thePL RS and/or TF RS, to enable the ED to detect the DL RS from therespective cell. The message 860 may be transmitted using NRPPa, forexample where each respective cell is a NG-RAN node.

At 815, the LMF transmits the configuration information 865 to the ED.For example, the configuration information 865 may be transmitted to theED 110 using LPP.

In one example, the present disclosure describes examples that enableconfiguration details of the PL RS and/or TF RS to be transmitted from anon-serving cell to the serving cell. The ED may then receive theconfiguration information, which originated from a non-serving cell, viathe serving cell.

In some examples, the serving cell may receive the configurationinformation of the PL RS and/or TF RS of a non-serving cell from the LMF(e.g., using NRPPa, in the case where the serving cell is a NG-RANnode). In some examples, the serving cell may receive this configurationinformation directly from the non-serving cell (e.g., using XnAP or F1AP). This configuration information may be received in response to arequest from the serving cell to the non-serving cell (e.g., transmittedvia the LMF using NRPPa in the case where the serving cell is a NG-RANnode, or transmitted directly from the serving cell to the non-servingcell using XnAP).

The ED may then receive the configuration information of the PL RSand/or TF RS from the serving cell (e.g., via RRC signaling). Notably,this configuration information may be received by the ED from theserving cell, however the PL RS and/or TF RS is received by the ED fromthe non-serving cell.

The example provides various mechanisms for communicating theconfiguration information of the PL RS and/or TF RS between thenon-serving cell(s) and the serving cell. In some examples, the LMF maybe used as an intermediate node for communicating this configurationinformation between the non-serving cell(s) and the serving cell.

FIG. 9 is a flowchart illustrating an example method 900 that may beperformed in accordance with the example described above. The method 900may be implemented in a BS of the serving cell (e.g., using a processingunit of the BS executing instructions stored in a memory of the BS).

FIGS. 10A-10E are example signal flow diagrams illustrating signalingbetween network entities, which may be used to implement the exampledescribed above. FIGS. 10A-10E show signaling performed by the ED 110, afirst BS 170 a in a serving cell (also referred to as the serving cellBS 170 a), a second BS 170 b in a non-serving cell (also referred to asthe non-serving cell BS 170 b), and the LMF 135. For simplicity, thepresent disclosure may refer to signals being transmitted to or from aserving cell or a non-serving cell; however, it should be understoodthat signaling to and from a cell is handled by the respective BS ofthat cell. For simplicity, only one serving and one non-serving cell areshown. However, it should be understood that there may be more than oneserving and/or non-serving cell.

FIGS. 9 and 10A-10E will be discussed together, for ease ofunderstanding.

At 905, optionally, the BS transmits a request requesting configurationinformation for PL RS and/or TF RS (generally referred to as DL RS) froma non-serving cell. The request may be transmitted directly to anon-serving cell (1005 in FIGS. 10A, 10B and 10E), or the request may betransmitted to the LMF (1040 in FIGS. 10C and 10D) to be relayed to thenon-serving cell.

In the example of FIG. 10A, the non-serving cell transmits DL RSconfiguration information 1010 to the LMF 135 to be forwarded to theserving cell at 1015.

In the example of FIG. 10B, at 1025 the non-serving cell requests agrant for sending configuration information to the serving cell, orrequests configuration information from the LMF 135. The LMF 135provides the requested grant or configuration information 1030. Thenon-serving cell then transmits the configuration information 1035 tothe serving cell.

In the example of FIG. 10C, the LMF 135 transmits a request forconfiguration information 1045 to the non-serving cell. The non-servingcell transmits the configuration information 1050 to the LMF 135, whichthen relays the configuration information to the serving cell at 1060.

In the example of FIG. 10D, the LMF 135 transmits a request forconfiguration information 1065 to the non-serving cell. The non-servingcell then directly transmits the configuration information 1070 to theserving cell.

In the example of FIG. 10E, the non-serving cell transmits theconfiguration information 1075 to the serving cell. The LMF 135 may notbe involved in this procedure.

At 910, the BS receives a message from the non-serving cell (1035 inFIG. 10B, 1070 in FIG. 10D, or 1075 in FIG. 10E) or the LMF (1015 inFIG. 10A, or 1060 in FIG. 10C) including the configuration informationto enable the ED to receive a DL RS from the non-serving cell. In someexamples, the configuration information may be received directly fromthe non-serving cell if the request (at 905) was transmitted directly tothe non-serving cell. The configuration information may be received viathe LMF if the request (at 905) was transmitted via the LMF. In otherexamples, the configuration information may be received directly fromthe non-serving cell or via the LMF regardless of how the request wastransmitted (or if no request was transmitted).

At 915, the BS transmits the configuration information to the ED (1020in FIGS. 10A-10E).

The various examples described herein may help to enable the ED toproperly receive DL RS from a cell (including a serving cell or anon-serving cell), and to determine PL and/or TF for transmission of aSRS to a cell (including a serving cell or a non-serving cell). Theseexamples may enable the SRS to be used for mobility purposes,positioning purposes, or any other application that may require the EDto transmit SRS to a cell (including a serving cell or a non-servingcell).

In some examples, the present disclosure describes a method at anelectronic device (ED), the method including: receiving configurationinformation from a network entity of a serving cell or a locationmanagement function (LMF), wherein the configuration informationcomprises one or more information associated with a positioningreference signal (PRS); detecting a received PRS from the serving cellor a non-serving cell based on the configuration information; andtransmitting a sounding reference signal (SRS) to the serving cell orthe non-serving cell, according to at least one of a path loss (PL)information and a spatial domain transmission filter (TF) information;wherein the at least one of the PL information and the spatial domain TFinformation is associated with the PRS.

In some examples, the configuration information may be received via: aradio resource control (RRC) signal from the serving cell; or a LTEpositioning protocol (LPP) message from the LMF.

In some examples, the configuration information may include a PRSidentifier (ID) field comprising a PRS identification for identifyingthe PRS from the serving cell or the non-serving cell.

In some examples, the configuration information may include anidentifier (ID) field indicating a physical cell ID (PCID) of theserving cell or the non-serving cell, or an ID of a network entitysending the PRS.

In some examples, the configuration information may include a quasicolocation Type-D (QCL-D) field providing information about anotherconfigured reference signal that is QCL-D with the PRS, and wherein theED is enabled to receive the PRS based on a configuration for theconfigured reference signal.

In some examples, the QCL-D field may include an index of the otherconfigured reference signal.

In some examples, the configuration information may include informationindicating at least one of: a New Radio Absolute Radio-Frequency ChannelNumber (NR ARFCN) for determining a frequency domain location of thePRS; a bandwidth of the PRS; a slot offset of the PRS; a frame offset ofthe PRS; a symbol offset of the PRS; a number of antenna ports of thePRS; a frame number at which the PRS is transmitted; a mutingconfiguration of the PRS; a frequency hopping configuration of the PRS;or a number of available narrowband for the PRS.

In some examples, the present disclosure describes a method at anelectronic device (ED), the method including: receiving configurationinformation from a network entity of a serving cell or a locationmanagement function (LMF), wherein the configuration informationcomprises one or more information associated with a synchronizationsignal/physical broadcast channel block (SSB) or a channel stateinformation reference signal (CSI-RS); the configuration informationincluding at least an identifier (ID) field containing an identificationof the SSB or CSI-RS, and a cell ID field including a physical cell ID(PCID) of a non-serving cell; detecting a received SSB or CSI-RS fromthe non-serving cell; and transmitting a sounding reference signal (SRS)to the non-serving cell, according to at least one of a path loss (PL)information and a spatial domain transmission filter (TF) information,wherein the at least one of the PL information and the spatial domain TFinformation is associated with the SSB or CSI-RS.

In some examples, the configuration information may include only the IDfield and the cell ID field.

In some examples, the configuration information may include a quasicolocation Type D (QCL-D) field providing information about anotherconfigured reference signal that is QCL-D with the SSB or CSI-RS, andwherein the ED is enabled to receive the SSB or CSI-RS based on aconfiguration for the configured reference signal.

In some examples, the QCL-D field may include an index of the otherconfigured reference signal.

In some examples, the configuration information may include at least oneof: a PCID of a cell associated with the other configured referencesignal; a New Radio Absolute Radio-Frequency Channel Number (NR ARFCN)for determining a frequency domain location of the other configuredreference signal; or a time domain reference to determine a time domainlocation of the other configured reference signal.

In some examples, the configuration information may originate from thenon-serving cell.

In some examples, the present disclosure describes a method at anelectronic device (ED), the method including: obtaining, by the ED, apath loss (PL) information or a spatial domain transmission filter (TF)information based on a second downlink (DL) reference signal (RS) aftera first DL RS has not been received during an expected time ortimeframe, or in absence of configuration information for receiving thefirst DL RS; and transmitting a sounding reference signal (SRS), the SRSbeing transmitted according to the PL information or TF information.

In some examples, the first DL RS may be a positioning reference signal(PRS) or a channel state information-reference signal (CSI-RS).

In some examples, the first DL RS may be a PRS, and the second DL RS maybe one of: a detected synchronization signal/physical broadcast channelblock (SSB); or a detected CSI-RS.

In some examples, the first DL RS may be a CSI-RS, and the second DL RSmay be one of: a detected synchronization signal/physical broadcastchannel block (SSB); or a detected PRS.

In some examples, the second DL RS may be detected from a non-servingcell indicated in configuration information for the first DL RL.

In some examples, one of a plurality of detected RSs may be selected asthe second DL RS, based on a highest reference signal received power(RSRP).

In some examples, the second DL RS may be a detected SSB used to obtainsystem information.

In some examples, the second DL RS may be a detected SSB configured fora serving cell.

In some examples, the method may include: receiving configurationinformation from a network entity of a serving cell or a locationmanagement function (LMF), wherein the configuration informationcomprises one or more information associated with the DL RS.

In some examples, the present disclosure describes a method at alocation management function (LMF), the method including: receiving aconfiguration message from a network entity of a cell, the configurationmessage comprising one or more information associated with a positioningreference signal (PRS); or the configuration message comprising one ormore information associated with a downlink (DL) reference signal (RS);and transmitting the information to an electronic device (ED).

In some examples, the configuration message may be received from thecell in absence of a request from the LMF.

In some examples, the method may include: transmitting a request to thecell, to request the information.

In some examples, the request may include a suggested value for aconfiguration field.

In some examples, communications between the LMF and the cell may be viaNew Radio Positioning Protocol A (NRPPa).

In some examples, the information may be transmitted to the ED via LTEPositioning Protocol.

In some examples, the present disclosure describes a method at a basestation (BS) of a serving cell, the method including: receiving aconfiguration message from a non-serving cell or a location managementfunction (LMF), the configuration message comprising one or moreinformation associated with a positioning reference signal (PRS), or theconfiguration message comprising one or more information associated witha downlink (DL) reference signal (RS); and transmitting the informationto an electronic device (ED).

In some examples, the method may include: transmitting a request for theinformation.

In some examples, the request may be transmitted to the LMF.

In some examples, the request may be transmitted directly to thenon-serving cell.

In some examples, communications between the serving cell and thenon-serving cell may be via Xn Application Protocol (XnAP) or F1Application Protocol (F1 AP).

In some examples, communications between the serving cell and the LMFmay be via New Radio Positioning Protocol A (NRPPa).

In some examples, the present disclosure describes an apparatusincluding: a processing unit configured to execute instructions to causethe apparatus to perform any of the methods described herein.

In some examples, the present disclosure describes a network entityincluding: a processing unit configured to execute instructions toimplement a location management function (LMF) for performing any of themethods described herein.

In some examples, the present disclosure describes a base stationincluding: a processing unit configured to execute instructions to causethe base station to perform any of the methods described herein.

Although the present disclosure describes methods and processes withsteps in a certain order, one or more steps of the methods and processesmay be omitted or altered as appropriate. One or more steps may takeplace in an order other than that in which they are described, asappropriate.

Although the present disclosure is described, at least in part, in termsof methods, a person of ordinary skill in the art will understand thatthe present disclosure is also directed to the various components forperforming at least some of the aspects and features of the describedmethods, be it by way of hardware components, software or anycombination of the two. Accordingly, the technical solution of thepresent disclosure may be embodied in the form of a software product. Asuitable software product may be stored in a pre-recorded storage deviceor other similar non-volatile or non-transitory computer readablemedium, including DVDs, CD-ROMs, USB flash disk, a removable hard disk,or other storage media, for example. The software product includesinstructions tangibly stored thereon that enable a processing device(e.g., a personal computer, a server, or a network device) to executeexamples of the methods disclosed herein. The machine-executableinstructions may be in the form of code sequences, configurationinformation, or other data, which, when executed, cause a machine (e.g.,a processor or other processing device) to perform steps in a methodaccording to examples of the present disclosure.

The present disclosure may be embodied in other specific forms withoutdeparting from the subject matter of the claims. The described exampleembodiments are to be considered in all respects as being onlyillustrative and not restrictive. Selected features from one or more ofthe above-described embodiments may be combined to create alternativeembodiments not explicitly described, features suitable for suchcombinations being understood within the scope of this disclosure.

All values and sub-ranges within disclosed ranges are also disclosed.Also, although the systems, devices and processes disclosed and shownherein may comprise a specific number of elements/components, thesystems, devices and assemblies could be modified to include additionalor fewer of such elements/components. For example, although any of theelements/components disclosed may be referenced as being singular, theembodiments disclosed herein could be modified to include a plurality ofsuch elements/components. The subject matter described herein intends tocover and embrace all suitable changes in technology.

1. A method at an electronic device (ED), the method comprising:receiving configuration information associated with a downlink (DL)reference signal (RS) in a first communication from a locationmanagement function (LMF) via LTE positioning protocol (LPP); receiving,in a second communication from a serving cell for the ED via radioresource control (RRC), an identifier (ID) of the DL RS and a cell ID ofa cell that originates the DL RS, wherein the configuration informationreceived in the first communication also includes the ID of the DL RSand the cell ID; and transmitting a sounding reference signal (SRS) tothe cell identified by the cell ID, according to path loss (PL)information or spatial domain transmission filter (TF) informationassociated with the DL RS.
 2. The method of claim 1, wherein the DL RSis a DL positioning reference signal (PRS), and wherein theconfiguration information associated with the DL RS includes one or moreof: a resource ID of the DL PRS; the cell ID of the cell that originatesthe DL PRS; a quasi colocation-Type-D (QCL-D) field providinginformation about another configured reference signal that is QCL-D withthe DL PRS; a New Radio Absolute Radio-Frequency Channel Number (NRARFCN) for determining a frequency domain location of the DL PRS; abandwidth of the DL PRS; a slot offset of the DL PRS; a frame offset ofthe DL PRS; a symbol offset of the DL PRS; a muting configuration of theDL PRS; a periodicity and offset of the DL PRS; and a scrambling ID ofthe DL PRS.
 3. The method of claim 1, wherein the DL RS is a DLsynchronization signal/physical broadcast channel block (SSB), andwherein the configuration information associated with the DL RS includesone or more of: a SSB index of the DL SSB; the cell ID of the cell thatoriginates the DL SSB; and one or more parameters locating the DL SSB intime-frequency domain.
 4. The method of claim 1, wherein theconfiguration information associated with the DL RS is received toenable the ED to use the DL RS for information other than PL and spatialdomain TF, and wherein the later second communication enables the ED touse the DL RS for PL information or spatial domain TF information. 5.The method of claim 1, wherein the configuration information associatedwith the DL RS is received to enable the ED to use the DL RS for PLinformation or spatial domain TF information.
 6. The method of claim 5,wherein the DL RS is a DL positioning reference signal (PRS), andwherein the configuration information associated with the DL RS includesone or more of: a resource ID of the DL PRS; the cell ID of the cellthat originates the DL PRS; a quasi colocation-Type-D (QCL-D) fieldproviding information about another configured reference signal that isQCL-D with the DL PRS; a New Radio Absolute Radio-Frequency ChannelNumber (NR ARFCN) for determining a frequency domain location of the DLPRS; a bandwidth of the DL PRS; a slot offset of the DL PRS; a frameoffset of the DL PRS; a symbol offset of the DL PRS; a mutingconfiguration of the DL PRS; a periodicity and offset of the DL PRS; anda scrambling ID of the DL PRS.
 7. The method of claim 5, wherein the DLRS is a DL synchronization signal/physical broadcast channel block(SSB), and wherein the configuration information includes one or moreof: a SSB index of the DL SSB; the cell ID of the cell that originatesthe DL SSB; and one or more parameters locating the DL SSB intime-frequency domain.
 8. An apparatus comprising: a non-transitorycomputer readable storage medium storing programming includinginstructions; and a processor configured to execute the instructions tocause the apparatus to: receive configuration information associatedwith a downlink (DL) reference signal (RS) in a first communication froma location management function (LMF) via LTE positioning protocol (LPP);receive, in a second communication from a serving cell for the apparatusvia radio resource control (RRC), an identifier (ID) of the DL RS and acell ID of a cell that originates the DL RS, wherein the configurationinformation received in the first communication also includes the ID ofthe DL RS and the cell ID; and transmit a sounding reference signal(SRS) to the cell identified by the cell ID, according to path loss (PL)information or spatial domain transmission filter (TF) informationassociated with the DL RS.
 9. The apparatus of claim 8, wherein the DLRS is a DL positioning reference signal (PRS), and wherein theconfiguration information associated with the DL RS includes one or moreof: a resource ID of the DL PRS; the cell ID of the cell that originatesthe DL PRS; a quasi colocation-Type-D (QCL-D) field providinginformation about another configured reference signal that is QCL-D withthe DL PRS; a New Radio Absolute Radio-Frequency Channel Number (NRARFCN) for determining a frequency domain location of the DL PRS; abandwidth of the DL PRS; a slot offset of the DL PRS; a frame offset ofthe DL PRS; a symbol offset of the DL PRS; a muting configuration of theDL PRS; a periodicity and offset of the DL PRS; and a scrambling ID ofthe DL PRS.
 10. The apparatus of claim 8, wherein the DL RS is a DLsynchronization signal/physical broadcast channel block (SSB), andwherein the configuration information associated with the DL RS includesone or more of: a SSB index of the DL SSB; the cell ID of the cell thatoriginates the DL SSB; and one or more parameters locating the DL SSB intime-frequency domain.
 11. The apparatus of claim 8, wherein theconfiguration information associated with the DL RS is received toenable the apparatus to use the DL RS for information other than PL andspatial domain TF, and wherein the later second communication enablesthe apparatus to use the DL RS for PL information or spatial domain TFinformation.
 12. The apparatus of claim 8, wherein the configurationinformation associated with the DL RS is received to enable theapparatus to use the DL RS for PL information or spatial domain TFinformation.
 13. The apparatus of claim 12, wherein the DL RS is a DLpositioning reference signal (PRS), and wherein the configurationinformation associated with the DL RS includes one or more of: aresource ID of the DL PRS; the cell ID of the cell that originates theDL PRS; a quasi colocation-Type-D (QCL-D) field providing informationabout another configured reference signal that is QCL-D with the DL PRS;a New Radio Absolute Radio-Frequency Channel Number (NR ARFCN) fordetermining a frequency domain location of the DL PRS; a bandwidth ofthe DL PRS; a slot offset of the DL PRS; a frame offset of the DL PRS; asymbol offset of the DL PRS; a muting configuration of the DL PRS; aperiodicity and offset of the DL PRS; and a scrambling ID of the DL PRS.14. The apparatus of claim 12, wherein the DL RS is a DL synchronizationsignal/physical broadcast channel block (SSB), and wherein theconfiguration information includes one or more of: a SSB index of the DLSSB; the cell ID of the cell that originates the DL SSB; and one or moreparameters locating the DL SSB in time-frequency domain.
 15. Anon-transitory computer-readable medium having instructions storedthereon, wherein the instructions when executed by a processor of anapparatus, cause the apparatus to: receive configuration informationassociated with a downlink (DL) reference signal (RS) in a firstcommunication from a location management function (LMF) via LTEpositioning protocol (LPP); receive, in a second communication from aserving cell for the apparatus via radio resource control (RRC), anidentifier (ID) of the DL RS and a cell ID of a cell that originates theDL RS, wherein the configuration information received in the firstcommunication also includes the ID of the DL RS and the cell ID; andtransmit a sounding reference signal (SRS) to the cell identified by thecell ID, according to path loss (PL) information or spatial domaintransmission filter (TF) information associated with the DL RS.
 16. Thecomputer-readable medium of claim 15, wherein the DL RS is a DLpositioning reference signal (PRS), and wherein the configurationinformation associated with the DL RS includes one or more of: aresource ID of the DL PRS; the cell ID of the cell that originates theDL PRS; a quasi colocation-Type-D (QCL-D) field providing informationabout another configured reference signal that is QCL-D with the DL PRS;a New Radio Absolute Radio-Frequency Channel Number (NR ARFCN) fordetermining a frequency domain location of the DL PRS; a bandwidth ofthe DL PRS; a slot offset of the DL PRS; a frame offset of the DL PRS; asymbol offset of the DL PRS; a muting configuration of the DL PRS; aperiodicity and offset of the DL PRS; and a scrambling ID of the DL PRS.17. The computer-readable medium of claim 15, wherein the DL RS is a DLsynchronization signal/physical broadcast channel block (SSB), andwherein the configuration information associated with the DL RS includesone or more of: a SSB index of the DL SSB; the cell ID of the cell thatoriginates the DL SSB; and one or more parameters locating the DL SSB intime-frequency domain.
 18. The computer-readable medium of claim 15,wherein the configuration information associated with the DL RS isreceived to enable the apparatus to use the DL RS for information otherthan PL and spatial domain TF, and wherein the later secondcommunication enables the apparatus to use the DL RS for PL informationor spatial domain TF information.
 19. The computer-readable medium ofclaim 15, wherein the configuration information associated with the DLRS is received to enable the apparatus to use the DL RS for PLinformation or spatial domain TF information.
 20. The computer-readablemedium of claim 19, wherein the DL RS is a DL positioning referencesignal (PRS), and wherein the configuration information associated withthe DL RS includes one or more of: a resource ID of the DL PRS; the cellID of the cell that originates the DL PRS; a quasi colocation-Type-D(QCL-D) field providing information about another configured referencesignal that is QCL-D with the DL PRS; a New Radio AbsoluteRadio-Frequency Channel Number (NR ARFCN) for determining a frequencydomain location of the DL PRS; a bandwidth of the DL PRS; a slot offsetof the DL PRS; a frame offset of the DL PRS; a symbol offset of the DLPRS; a muting configuration of the DL PRS; a periodicity and offset ofthe DL PRS; and a scrambling ID of the DL PRS.